Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ad9d815aab4150…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 23:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07e4ecab80f6b0f083cd8feed7b6350d SHA-1: e713dd8258998207a0f670755f0ea1da08a1c10a SHA-256: 84ad9d815aab415067eafab92589dfc9a16713957751bff5f4559b7eb5f4d02b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing a trojan. The presence of external URIs and link farm characteristics points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=download+vidmate+apk+latest+version+2020 PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aaa742933---44083058527.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/36688605456.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/37374760046.pdfIn PDF document text
    • http://bresky.cz/res/file/motojexizapufesekulup.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/57108205883.pdfIn PDF document text
    • http://citra.cl/userfiles/file/97056516544.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/gabirerifoduwena.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/041456349686.pdfIn PDF document text
    • http://dnepropress.net/files/file/58347999484.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/bibarexoravorerozeze.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/jikotidimezowojesinom.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/75047258737.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/xakepelaw.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/todizoxosimofawixobiwot.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141a4b06cacf---gomalafajomu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161377f3c2bb5b---90578668152.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/6059443618.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/19821621004.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/77724776583.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/23466109817.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/67597751754.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/penotowevositodilororan.pdfIn PDF document text
    • http://princeverma.in/uploads/files/37456049060.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 17896 bytes
SHA-256: 9c0a3437bbb017beb2a892aed8177ef97b7769003af237958f2c014b5beacc51
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 11040 bytes
SHA-256: b2d5138849a53c636de3b88666841bffc195d531786be637985bacf8b2a6c934